From the statement by General of the Army General Valery Gerasimov, Chief of the General Staff of the Armed Forces of the Russian Federation:
In accordance with the decision of the Supreme Commander-in-Chief of the Armed Forces of the Russian Federation, Vladimir Putin, the Russian Defense Ministry is starting to reduce the grouping of the Armed Forces in Syria.

An aircraft carrier group led by Admiral Kuznetsov has been performing tasks off the coast of Syria since last fall. The first combat sorties of airplanes with strikes against terrorist groups in Syria from the aircraft-carrying cruiser were carried out on November 15. In total, about 420 sorties were carried out, during which more than 1200 objects of terrorist groups of the IG and the Front al-Nusra were hit (banned in Russia).
During combat duty, unfortunately, not without incidents involving the loss of aircraft wing aircraft. So, November 14, after performing a training flight, the carrier-based MiG-29K fighter fell into the sea, and December 5 - Su-33. In both of these cases, the pilots remained alive. The investigation into the causes of the crash continues.